I've been trying to get 0.7.2 because that's what I'm familiar with (I'm sure I can live with 0.7.4 though), and now in my attempts to get it I've come across that (see screenshot) it's deprecated. So should I be looking to get 0.7.4 or maybe I should be abandoning Sigil altogether for Calibre's "Edit E-book" because 0.7.4 will soon be deprecated?

Calibre editor is getting greater each week, but it lacks clips (which can be replaced by Phrase Express or other macro program) and no spell checker which is pretty necessary in finding content errors, as opposed to coding errors.

Much of the difficulty has to do with non-breaking spaces which is not so important for a novelist. As long as it works and as long as you can do backups frequently, stay with it for now.

I have generally switched over to the calibre editor, but since I am transcribing an PDF, now that I am nearly done I have come back to Sigil, hoping I lose nothing in translation for the spellcheck and capitalization features.

$5 for what it is worth, $5 since 2 cents isn't worth a plugged nickel anymore!

Calibre editor is getting greater each week, but it lacks clips (which can be replaced by Phrase Express or other macro program) and no spell checker which is pretty necessary in finding content errors, as opposed to coding errors.

Much of the difficulty has to do with non-breaking spaces which is not so important for a novelist. As long as it works and as long as you can do backups frequently, stay with it for now.

I have generally switched over to the calibre editor, but since I am transcribing an PDF, now that I am nearly done I have come back to Sigil, hoping I lose nothing in translation for the spellcheck and capitalization features.

$5 for what it is worth, $5 since 2 cents isn't worth a plugged nickel anymore!

Thanks mrmikel. I was just comparing Sigil and the Calibre Editor. Sigil's lines are so much cleaner looking. By comparison Calibre Editor's text looks bunched together. I like much about the Calibre Editor's features,but I'm still leaning toward Sigil. Although I still can't get Sigil on my other Linux computer, so I may have to use the Calibre Editor. I'm sure they'll both do nicely ultimately.

What it means, is that support (aka changes) are only done on the latest branch and not older releases. However, I still work with 0.7.2 without issues as it fits my work pattern better and I don't need/like the new features in 0.7.3/0.7.4.

The best you can do is just compile Sigil yourself I guess. I know I installed it on my Linux Mint machine some time ago and it was not that complicated for me.

It is really a matter of preference and the level of editing required.

The more heavily you format and the more complicated the formatting, the more the calibre editor is useful to me. This is because the results of the formatting is immediately visible in the preview window. If I do something that ought to work and it doesn't I can immediately correct it. Also I can undo and revert to hearts content from going where no editor ought have gone, before or after!

Gregg, your work is mostly completed in a word processor and you are just making an adjustment here and there. The wide open screen of Sigil is more pleasant for that.

The deprecated note is silly since 7.2 and 7.4 are maintained the same these days, not at all.

7.4 is just enhancements / bug fixes to 7.2
With normal software, you don't keep older versions on a branch 'Active'

Simple answer: Unless there is a known bug/incompatibility in 7.4 that impacts your use, use the latest on the branch

Over to Calibre.
1 absolute reason to use the Calibre editor is if you are combining input that used a folder structure per section (and the files within used the same names as contained other source folders).
In Sigil, the files get removed from any folders and flattened into Sigils:Text,Images,Styles.

An unholy mess is the result (the last source file with that name is all there is left) eg.
P01folder
Part01.html

For Sigil, there's the right way, the wrong way and the Sigil way. It is always the same, so it is easy to deal with...unless you have theducks situation.

Calibre doesn't care what the structure is and doesn't change it. That can mean a little less handholding and doing for you if it is only a small mess instead of a big mess.

I agree in general about using the latest version, but handling the non-breaking spaces bounced sort of back and forth. Sigil also doesn't show invisible characters at all. At least in calibre, you can cursor along and see what is there and with some effort fiddle with them. Sigil treats them as if they don't exist.

This is mostly fine until you import some web page junk. Then it can become an issue.

Thanks for the great explanations, guys. Now I know what's going on. And my needs are nowhere near as sophisticated as yours. And I LIKE Sigil and I know how to make ebooks with it. Right now Calibre's Editor is just like a text editor to me. How to go about making chapters and headings and tocs, well, I'm sure it can be done there, but I will have to learn the process all over again. Your feedback makes my decisions much easier though. Appreciate it greatly.

Thanks for the great explanations, guys. Now I know what's going on. And my needs are nowhere near as sophisticated as yours. And I LIKE Sigil and I know how to make ebooks with it. Right now Calibre's Editor is just like a text editor to me. How to go about making chapters and headings and tocs, well, I'm sure it can be done there, but I will have to learn the process all over again. Your feedback makes my decisions much easier though. Appreciate it greatly.

Just because there are new/updated tools doesn't mean the old ones stopped working the way they used to!